package com.example.skycode5.dao;

import com.example.skycode5.bean.NewsBean;
import com.example.skycode5.util.DBConnection;
import com.example.skycode5.util.Time;

import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class NewsDao {
    DBConnection DBConn = new DBConnection();

    // todo 后期添加分页功能
    public List<NewsBean> getList(int page) {
        Connection conn = DBConn.getConn();
        String sql = "select * from news limit " + (page - 1) * 10 + ",10";
        List<NewsBean> list = new ArrayList<NewsBean>();
        try {
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()) {
                NewsBean newsBean = new NewsBean();
                newsBean.setNewsID(rs.getInt("newsID"));
                newsBean.setNewsTitle(rs.getString("NewsTitle"));
                newsBean.setNewsContent(rs.getString("NewsContent"));
                newsBean.setNewsTime(Integer.parseInt(rs.getString("NewsTime")));
                newsBean.setAdminName(rs.getString("AdminName"));
                list.add(newsBean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }

    public int add(NewsBean news) {
        Connection conn = DBConn.getConn();
        String sql = "insert into news values(null,?,?,?,?)";
        try {
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1, news.getNewsTitle());
            pmst.setString(2, news.getNewsContent());
            pmst.setString(3, (Time.getDate()));
            pmst.setString(4, (news.getAdminName()));
            return pmst.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public int update(NewsBean news) {
        Connection conn = DBConn.getConn();
        String sql = "update news set NewsTitle=?,NewsContent=?,NewsTime=?,AdminName=? where newsID=?";
        try {
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1, news.getNewsTitle());
            pmst.setString(2, news.getNewsContent());
            pmst.setString(3, (new Date()).toString());
            pmst.setString(4, news.getAdminName());
            pmst.setInt(5, news.getNewsID());
            return pmst.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public int delete(int newsID) {
        Connection conn = DBConn.getConn();
        try {
            String sql = "delete from news where newsID=?";
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1, newsID);
            return pmst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * 统计新闻总条数
     *
     * @return
     */
    public int count() {
        Connection conn = DBConn.getConn();
        try {
            String sql = "select count(*) from news";
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);
            if (rs.next()) {
                return rs.getInt(1);//cout查询返回一行数据 第一行第一列就是总条数
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public NewsBean getNewsById(int id) {
        try {
            String sql = "select * from news where newsID=?";
            NewsBean newsBean = new NewsBean();
            Connection conn = DBConn.getConn();
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1, id);
            ResultSet rs = pmst.executeQuery();
            if (rs.next()){
                newsBean.setNewsID(rs.getInt(1));
                newsBean.setNewsTitle(rs.getString(2));
                newsBean.setNewsContent(rs.getString(3));
                newsBean.setNewsTime(rs.getInt(4));
                newsBean.setAdminName(rs.getString(5));
                return newsBean;
              }
        } catch (SQLException e) {
            e. printStackTrace();
        }
        return null;
    }
    }
